Refractory metal superalloys have the potential to facilitate a significant increase in gas turbine operating temperatures that would enhance efficiency and reduce emissions. However, fulfilling this potential requires a much more detailed understanding of the underlying metallurgy and how it is influenced by alloying additions. Here, the influence of systematically varying the Nb:Ta ratio in a series of Ti–Zr–Nb–Ta alloys has been studied and compared to thermodynamic predictions. The experimental results show that higher Nb:Ta ratios suppress phase separation but lower the inter-phase misfit. As such, optimizing these alloys for specific applications will require careful balancing of these effects.
The influence of the Nb:Ta ratio on the microstructural evolution in refractory metal superalloy systems
Note: This paper is part of the APL Special Collection on Metastable High Entropy Alloys.
T. E. Whitfield, G. J. Wise, H. J. Stone, N. G. Jones; The influence of the Nb:Ta ratio on the microstructural evolution in refractory metal superalloy systems. Appl. Phys. Lett. 22 November 2021; 119 (21): 211901. https://doi.org/10.1063/5.0068045
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